Question:

9. A researcher designs an experiment to investigate whether soil bacteria trigger the synthesis of defense enzymes in plant roo

9. A researcher designs an experiment to investigate whether soil bacteria trigger the synthesis of defense
enzymes in plant roots. The design of the experiment is presented in Table 1. For each group in the
experiment, the researcher will determine the average rate of change in the amount of defense enzymes
in the roots of the seedlings.
Table 1. An experiment to investigate the effect of soil bacteria on plant
defenses
Group
Number of
Seedlings
Type of
Soil
Treatment Solution
1
10
Contains actively
reproducing soil bacteria
2
10
Sterile
potting
soil
Sterile
potting
soil
Sterile
potting
soil
Contains heat-killed soil
bacteria
3
10
Contains no soil bacteria
Which of the following statements best helps justify the inclusion of group 2 as one of the controls in the
experiment?
a. It will show whether the changes observed in group 1 depend on the metabolic activity of soil
bacteria.
b. It will show whether the changes observed in group 1 depend on the type of plants used in the
experiment.
c. It will show the average growth rate of seedlings that are maintained in a non-sterile
environment.
d. It will show the changes that occur in the roots of seedlings following an infection by soil
bacteria.

9. A researcher designs an experiment to investigate whether soil bacteria trigger the synthesis of defense enzymes in plant roots. The design of the experiment is presented in Table 1. For each group in the experiment, the researcher will determine the average rate of change in the amount of defense enzymes in the roots of the seedlings. Table 1. An experiment to investigate the effect of soil bacteria on plant defenses Group Number of Seedlings Type of Soil Treatment Solution 1 10 Contains actively reproducing soil bacteria 2 10 Sterile potting soil Sterile potting soil Sterile potting soil Contains heat-killed soil bacteria 3 10 Contains no soil bacteria Which of the following statements best helps justify the inclusion of group 2 as one of the controls in the experiment? a. It will show whether the changes observed in group 1 depend on the metabolic activity of soil bacteria. b. It will show whether the changes observed in group 1 depend on the type of plants used in the experiment. c. It will show the average growth rate of seedlings that are maintained in a non-sterile environment. d. It will show the changes that occur in the roots of seedlings following an infection by soil bacteria.

Answer

(
Auswer correct option- (b)
It will show whether the change observed in
1
group 1 depend on the type of plant used
qu the expenment
das
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